The oxidation reaction with ozone for lignite gasification wastewater was investigated in batch reactors.The influencing factors of ozone doisng rate, pH,temperature and reaction time were investigated.The optimal reaction conditions were:initial pH≈3,ozone doisng rate of 10 mg/(L·min),temperature of about 40 ℃ and reaction time of 180 min.Results indicated that removal of chemical oxygen demand(CODCr)and volatile phenols could be reached 30% and 95%.The biochemical oxygen demand(BOD5)/CODCr could get up to 0.5.The gas chromatography-mass spectrometry(GC-MS)analysis showed that ozone could remove more than 90% of phenols,petroleum,aromatic substances in lignite gasification wastewater.